US7860325B2 - Image processing apparatus and image processing method for parallel decompression of image files - Google Patents
Image processing apparatus and image processing method for parallel decompression of image files Download PDFInfo
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- US7860325B2 US7860325B2 US11/789,623 US78962307A US7860325B2 US 7860325 B2 US7860325 B2 US 7860325B2 US 78962307 A US78962307 A US 78962307A US 7860325 B2 US7860325 B2 US 7860325B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/436—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation using parallelised computational arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1297—Printer code translation, conversion, emulation, compression; Configuration of printer parameters
Definitions
- the present invention relates to an image processing apparatus and an image processing method. More specifically, the present invention relates to an image processing apparatus and an image processing method for efficiently performing a decompression processing, that is, a processing for decompressing image data stored as compressed image data, as a preprocessing of a processing for converting image data into optimum print data.
- a decompression processing that is, a processing for decompressing image data stored as compressed image data, as a preprocessing of a processing for converting image data into optimum print data.
- the image data is usually stored as compressed image data. Due to this, it is necessary to decompress a compressed image data of the compressed image data before the image data is converted into the print data.
- Conventional techniques of performing the decompression processing for decompressing the compressed image data in a standalone printer unconnected to a computer include one for performing the decompression processing using a decompression processing program as software executed by an arithmetic processing device included in the printer. Such a technique is disclosed in, for example, Japanese Patent No. 3661520.
- the decompression processing by execution of the decompression processing program produces a heavy load.
- the heavy load caused by the decompression processing is one cause for performance deterioration.
- Examples of a conventional technique for solving the problem of performance deterioration include the following decompression processing technique.
- Compressed image data is decompressed using hardware by storing such parameters as a file pointer and a rotation information map and such tables as a Huffman decompression table and a quantization table necessary to decompress the compressed image data file in a storage device such as a RAM, an EEPROM or an HDD (hard disk drive), loading those parameters and tables from the storage device into a processing device (hardware) such as an ASIC (application specific integrated circuit) or an arithmetic processing device, and using the parameters and tables loaded into the hardware.
- a storage device such as a RAM, an EEPROM or an HDD (hard disk drive)
- a processing device such as an ASIC (application specific integrated circuit) or an arithmetic processing device
- the hardware-based decompression processing performed on the compressed image data is characterized by executing the decompression processing by loading the parameters and the tables into the processing apparatus such as the ASIC from the storage device before using the parameters and the tables without performing the decompression processing using the software executed by the arithmetic processing device.
- the hardware-based, decompression processing has a higher decompression processing rate than that of the software-based based decompression processing.
- the hardware-based decompression processing has the following disadvantages. If a plurality of image data files included in a print page data file as a printing subject, i.e., a plurality of compressed image data files to be subjected to the decompression processing prior to execution of printing is present, and those compressed image data files are decompressed in parallel using the hardware-based decompression processing technique, then overhead for loading the parameters such as a file pointer and a rotation information map and the tables such as a Huffman decompression table and a quantization table in an SRAM, a register or the like for each image data file and replacing decompression progress information is increased. The longer overhead makes it difficult to perform the hardware-based decompression processing at the higher processing rate than that of the software-based decompression processing.
- the software-based decompression processing is generally lower in processing rate than the hardware-based decompression processing.
- a plurality of compressed image data files as a decompression processing subject is present, that is, if the compressed image data files are switched over frequently, the software-based decompression processing can make such switching easily at high speed, as compared with the hardware-based decompression processing.
- the software-based decompression processing can be performed at a higher processing rate than that of the hardware-based decompression processing.
- both of the hardware-based decompression processing and the software-based decompression processing are performed in parallel when a plurality of compressed image data files are present as a decompression processing subject.
- an image processing method comprising:
- a second processing step reading and executing the decompression processing program stored in the first storage device, and acquiring and reading the plurality of tables stored in the first storage device and the plurality of parameters stored in the second storage device, thereby decompressing the compressed image data file,
- first processing step and the second processing step are used in parallel, and one of the compressed image data files is decompressed at the first processing step, and remaining compressed image data files are decompressed at the second processing step when a plurality of compressed image data files are decompressed by a parallel processing.
- the image processing method capable of accelerating the decompression processing rate whether the decompression processing subject is a single compressed image data file or a plurality of compressed image data files, since the hardware-based decompression processing and the software-based decompression processing are performed in parallel when a plurality of compressed image data files as the decompression processing subject is present, while the hardware-based decompression processing that enables a high-rate decompression processing in many cases is basically used.
- the compressed image data file is decompressed at the first processing step when the decompression processing subject is one compressed image data file.
- the compressed image data file as the decompression processing subject may be compressed by JPEG compression, JPEG being Joint Photographic Experts Group.
- the compressed image data file as the decompression processing subject may be subjected to an image correction processing after being decompressed.
- an image processing apparatus comprising:
- a first storage device storing therein a plurality of tables including a predetermined decompression table and a quantization table necessary to decompress a compressed image data file, and storing therein a decompression processing program for decompressing the compressed image data file;
- a second storage device storing therein a plurality of parameters including a rotation information map and a file pointer created and updated while the compressed image data file is being decompressed;
- a first processing device acquiring and loading the plurality of tables stored in the first storage device and the plurality of parameters stored in the second storage device, and decompressing the compressed image data file;
- a second processing device reading and executing the decompression processing program stored in the first storage device, and acquiring and reading the plurality of tables stored in the first storage device and the plurality of parameters stored in the second storage device, thereby decompressing the compressed image data file
- one of the compressed image data files is decompressed by the first processing device, and remaining compressed image data files are decompressed by the second processing device when a plurality of compressed image data files are decompressed by a parallel processing.
- the image processing apparatus capable of accelerating the decompression processing rate whether the decompression processing subject is a single compressed image data file or a plurality of compressed image data files, since the hardware-based decompression processing and the software-based decompression processing are performed in parallel when a plurality of compressed image data files as the decompression processing subject is present, while the hardware-based decompression processing that enables a high-rate decompression processing in many cases is basically used.
- the compressed image data file is decompressed by the first processing device when a decompression processing subject is one compressed image data file.
- the compressed image data file as a decompression processing subject may be stored in a predetermined recording medium, and read by and input to at least one of the first processing device and the second processing device.
- the compressed image data file as the decompression processing subject may be compressed by JPEG compression, JPEG being Joint Photographic Experts Group.
- the compressed image data file as the decompression processing subject may be subjected to an image correction processing after being decompressed.
- the first processing device and the second processing device may be different processing devices or the same processing device can be used as both the first processing device and the second processing device.
- the first storage device and the second storage device may be different storage devices or the same storage device can be used as both the first storage device and the second storage device.
- FIG. 1 is an explanatory view typically showing timings of securing and releasing parameters and tables to correspond to each of images when a plurality of compressed image data files is decompressed in parallel;
- FIG. 2 is an explanatory view typically showing a configuration of a parameter table region in a memory holding the parameters and tables to correspond to each of images when a plurality of compressed image data files is decompressed in parallel;
- FIG. 3 is a flowchart showing an example of ordinary image correction processing procedures including the processing for decompressing the compressed image data file;
- FIG. 4 is a flowchart showing an example of processing procedures for the software-based decompression processing method
- FIG. 5 is a flowchart showing an example of processing procedures for the hardware-based decompression processing method
- FIG. 6 is a flowchart showing procedures of a processing for decompressing compressed image data files according to one embodiment of the present invention.
- FIG. 7 is a block diagram showing a configuration of an image processing apparatus according to the embodiment of the present invention.
- FIG. 1 is an explanatory view typically showing the timings of securing and releasing memory areas for acquiring and holding the parameters and the tables to correspond to each of images when a plurality of compressed image data files is decompressed in parallel.
- FIG. 2 is an explanatory view typically showing the configuration of the memory areas secured and released to acquire and hold the parameters and the tables to correspond to each of images when a plurality of compressed image data files is decompressed in parallel.
- one print page data file includes compressed image data files of six images 1 , 2 , 3 , 4 , 5 , and 6 , respectively. It is also assumed that the processing for decompressing the compressed image data files is performed for every raster from top to down in FIG. 1 .
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- a step 1 the image 1 is discovered, and parameters and tables are acquired to correspond to the compressed image data file of the image 1 .
- a region 1 for holding the parameters and the tables acquired to correspond to the compressed image data file of the image 1 is secured in a memory with a position of an initial pointer set as a starting point. From this moment, a processing for decompressing the compressed image data file of the image 1 starts.
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- the image 2 is discovered, and parameters and tables are acquired to correspond to the compressed image data file of the image 2 .
- a region 2 for holding the parameters and the tables acquired to correspond to the compressed image data file of the image 2 is secured in the memory with an end position of the holding region 1 of the parameters and the tables corresponding to the image 1 set as a starting point. From this moment, a processing for decompressing the compressed image data file of the image 2 starts.
- the compressed image data flies included in the print page data file are sequentially searched for every print line position.
- the image 3 is discovered, and parameters and tables are acquired to correspond to the compressed image data file of the image 3 .
- a region 3 for holding the parameters and the tables acquired to correspond to the compressed image data file of the image 3 is secured in the memory with an end position of the holding region 2 of the parameters and the tables corresponding to the image 2 set as a starting point. From this moment, a processing for decompressing the compressed image data file of the image 3 starts.
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- the initial pointer reaches the end position of the image 1 and the processing for decompressing the compressed image data file of the image 1 ends.
- the parameters and the tables acquired to correspond to the compressed image data file of the image 1 become unnecessary. Therefore, the holding region 1 of the parameters and the tables acquired to correspond to the compressed image data file of the image 1 becomes unnecessary.
- the holding region 1 is released and the memory area for securing the holding region 1 becomes blank.
- the memory area is rearranged.
- the holding region 2 of the parameters and the tables corresponding to the image 2 is secured with the position of the initial pointer as a starting point.
- the holding region 3 of the parameters and the tables corresponding to the image 3 is secured with the position of a new end position of the holding region 2 of the parameters and the tables corresponding to the image 2 as a starting point.
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- the initial pointer reaches the end position of the image 2 and the processing for decompressing the compressed image data file of the image 2 ends.
- the parameters and the tables acquired to correspond to the compressed image data file of the image 2 become unnecessary. Therefore, the holding region 2 of the parameters and the tables acquired to correspond to the compressed image data file of the image 2 becomes unnecessary.
- the holding region 2 is released and the memory area for securing the holding region 2 becomes blank.
- the memory area is rearranged.
- the holding region 3 of the parameters and the tables corresponding to the image 3 is secured with the position of the initial pointer as a starting point.
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- the image 4 is discovered, and the parameters and the tables are acquired to correspond to the compressed image data file of the image 4 .
- a region 4 for holding the parameters and the tables acquired to correspond to the compressed image data file of the image 4 is secured in the memory with an end position of the holding region 3 of the parameters and the tables corresponding to the image 3 set as a starting point. From this moment, a processing for decompressing the compressed image data file of the image 4 starts.
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- the initial pointer reaches the end position of the image 3 and the processing for decompressing the compressed image data file of the image 3 ends.
- the parameters and the tables acquired to correspond to the compressed image data file of the image 3 become unnecessary. Therefore, the holding region 3 of the parameters and the tables acquired to correspond to the compressed image data file of the image 3 becomes unnecessary.
- the holding region 3 is released and the memory area for securing the holding region 3 becomes blank.
- the memory area is rearranged.
- the holding region 4 of the parameters and the tables corresponding to the image 4 is secured with the position of the initial pointer as a starting point.
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- the image 5 is discovered, and the parameters and the tables are acquired to correspond to the compressed image data file of the image 5 .
- a region 5 for holding the parameters and the tables acquired to correspond to the compressed image data file of the image 5 is secured in the memory with an end position of the holding region 4 of the parameters and the tables corresponding to the image 4 set as a starting point. From this moment, a processing for decompressing the compressed image data file of the image 5 starts.
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- the image 6 is discovered, and the parameters and the tables are acquired to correspond to the compressed image data file of the image 6 .
- a region 6 for holding the parameters and the tables acquired to correspond to the compressed image data file of the image 6 is secured in the memory with an end position of the holding region 5 of the parameters and the tables corresponding to the image 5 set as a starting point. From this moment, a processing for decompressing the compressed image data file of the image 6 starts.
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- the initial pointer reaches the end position of the image 4 and the processing for decompressing the compressed image data file of the image 4 ends.
- the parameters and the tables acquired to correspond to the compressed image data file of the image 4 become unnecessary. Therefore, the holding region 4 of the parameters and the tables acquired to correspond to the compressed image data file of the image 4 becomes unnecessary.
- the holding region 4 is released and the memory area for securing the holding region 4 becomes blank.
- the memory area is rearranged.
- the holding region 5 of the parameters and the tables corresponding to the image 5 is secured with the position of the initial pointer as a starting point.
- the holding region 6 of the parameters and the tables corresponding to the image 6 is secured with the position of a new end position of the holding region 5 as a starting point.
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- the initial pointer reaches the end position of the image 5 and the processing for decompressing the compressed image data file of the image 5 ends.
- the parameters and the tables acquired to correspond to the compressed image data file of the image 5 become unnecessary. Therefore, the holding region 5 of the parameters and the tables acquired to correspond to the compressed image data file of the image 5 becomes unnecessary.
- the holding region 5 is released and the memory area for securing the holding region 5 becomes blank.
- the memory area is rearranged.
- the holding region 6 of the parameters and the tables corresponding to the image 6 is secured with the position of the initial pointer as a starting point.
- the compressed image data files included in the print page data file are sequentially searched for every print line position.
- the initial pointer reaches the end position of the image 6 and the processing for decompressing the compressed image data file of the image 6 ends.
- the parameters and the tables acquired to correspond to the compressed image data file of the image 6 become unnecessary. Therefore, the holding region 6 of the parameters and the tables acquired to correspond to the compressed image data file of the image 6 becomes unnecessary.
- the holding region 6 is released and the memory area for securing the holding region 6 becomes blank.
- the processing for decompressing the respective compressed image data files of all the images is finished, and all the memory areas are released. Namely, the processing for decompressing the respective compressed image data files of the six images 1 , 2 , 3 , 4 , 5 , and 6 included in the print page data file is finished.
- the six images 1 , 2 , 3 , 4 , 5 , and 6 are arranged on one print page, and the number of holding regions of the parameters and the tables secured in the memory simultaneously is up to three. This means that the number of compressed image data files to be decompressed in parallel is up to three.
- the software-based decompression processing is generally lower in processing rate than the hardware-based decompression processing.
- the software-based decompression processing can make such switching easily at high speed, as compared with the hardware-based decompression processing.
- the software-based decompression processing can be performed at a higher processing rate than that of the hardware-based decompression processing.
- the image processing apparatus and the image processing method according to the embodiments of the present invention intend to accelerate the decompression processing rate of decompressing the image data file by basically performing the hardware-based decompression processing that can be performed at high processing rate in many cases, and performing the hardware-based decompression processing and the software-based decompression processing in parallel when a plurality of decompressed image data files as the decompression processing subject are present.
- FIG. 3 is a flowchart showing an example of ordinary image correction processing procedures including the processing for decompressing the compressed image data file.
- a compressed image data file included in a print page data file as a printing subject i.e., a compressed image data file to be subjected to an image correction processing prior to execution of printing and to be subjected to the decompression processing prior to execution of the image correction processing is searched at the print line position N (hereinafter, “position N”) of the print page data file (step S 102 ).
- step S 109 If the number M of the compressed image data files that are discovered and are not decompressed yet is zero as a result of searching the compressed image data file at the position N (“No”, step S 103 ), there is no need to further perform a decompression processing at the position N. Therefore, the processing goes to processing procedures at a step of performing a halftone processing (step S 109 ) to be described later and subsequent steps.
- step S 104 If the number M of the compressed image data files that are discovered and that are not decompressed yet is greater than zero (M>0) as a result of searching the compressed image data files at the position N (“Yes”, step S 103 ),that is, one or more compressed image data files that are not decompressed yet are present, an M th compressed image data file among the M compressed image data files that are discovered and that are not decompressed yet is decompressed at the position N (step S 104 ).
- the hardware-based decompression processing method and the software-based decompression processing method have been conventionally used independently of each other as already stated. These decompression processing methods and a decompression processing technique based on the image processing apparatus and the image processing method according to the embodiments of the present invention will be described later in detail.
- the processing device such as an ASIC or an arithmetic processing device (CPU) performs sampling and statistic value calculation on input image data to be decompressed based on a part of a function of a decompression processing program (software).
- Correction parameters for the correction processing on the image data are decided while being associated with respective grid points on a three-dimensional (3D) lookup table based on the result of the sampling and the statistic value calculation.
- the 3D lookup table constituted by the correction parameters is created in advance.
- the created 3D lookup table is stored in a storage device such as a RAM, an EEPROM or HDD.
- an image data correction processing program is stored In the storage device such as a ROM, a RAM, an EEPROM or HDD in advance.
- image data correction processing could include the following three color correction processings: a tone curve correction processing performed according to a tone curve representing the tone relation between input image data (original image data) and output image data (corrected image data), a chroma correction processing for setting highlight degrees of respective colors of red (R), green (G), and blue (B), and a memory color correction processing for making the colors closer to ideal colors which a person feels beautiful when he or she looks at the colors, that is, memory colors.
- a tone curve correction processing performed according to a tone curve representing the tone relation between input image data (original image data) and output image data (corrected image data
- a chroma correction processing for setting highlight degrees of respective colors of red (R), green (G), and blue (B)
- a memory color correction processing for making the colors closer to ideal colors which a person feels beautiful when he or she looks at the colors, that is, memory colors.
- the image data correction processing is either a hardware-based correction processing using the 3D lookup table and interpolation operation or a software-based sequential correction processing.
- the processing device such as the ASIC or the CPU accesses the storage device. Furthermore, the processing device (hardware) performs an arithmetic processing including an interpolation operation with respect to the respective points of the input image data using the 3D lookup table (“3D-LUT”) stored in the storage device. The processing device (hardware) thereby sequentially outputs output image data that are to constitute print image data.
- the processing device such as the ASIC or the CPU accesses the storage device. Furthermore, the processing device (hardware) performs an arithmetic processing including an interpolation operation with respect to the respective points of the input image data using the 3D lookup table (“3D-LUT”) stored in the storage device. The processing device (hardware) thereby sequentially outputs output image data that are to constitute print image data.
- 3D-LUT 3D lookup table
- the hardware-based image data correction processing using the arithmetic processing including the interpolation operation is to collectively perform color correction processings such as the tone curve correction, the chroma correction, and the memory color correction by the arithmetic processing including the interpolation operation.
- a correction processing program stored in the storage device is read and executed.
- the input image data is thereby corrected and the output image data that is to constitute the print image data is sequentially output.
- a size conversion processing for converting the image size into an image size at which an actual printing is executed (step S 106 )
- a layout processing for arranging the images according to a set layout (step S 107 ) are sequentially executed for the output image data as the print image data.
- the processing returns to the step S 103 .
- step S 109 the processing goes to processing procedures at the step of performing the halftone processing (step S 109 ) and the subsequent steps.
- step S 109 the halftone processing for converting a tone of each image into a tone at a gradient which the printer can deal with is performed.
- Final print image data that can be actually printed is output and printed (step S 110 ).
- the hardware-based decompression processing method and the software-based decompression processing method have been conventionally used independently of each other as already stated.
- FIG. 4 is a flowchart showing an example of processing procedures for the software-based decompression processing method.
- step S 201 If the print line position N at which the search is conducted is the first line position of the compressed image data file (“Yes”, step S 201 ), then the compressed image data file is opened, the Huffman decompression table and the quantization table for the decompression processing is acquired to correspond to the compressed image data file (step S 202 ).
- an image data compression scheme is JPEG (Joint Photographic Experts Group) by way of example.
- step S 203 After acquiring the tables for the decompression processing, it is determined whether it is necessary to rotate the image corresponding to the compressed image data file by 90 degrees (step S 203 ).
- step S 204 If it is determined that it is necessary to rotate the image (“Yes”, step S 203 ), a rotation information map is created (step S 204 ).
- the steps S 203 and S 204 are a preprocessing of a processing for rotating the image by 90 degrees at subsequent steps S 213 and S 214 , and executed uniquely if the image data compression scheme is JPEG.
- the steps S 203 and S 204 and the subsequent steps S 213 and S 214 are not executed.
- the decompression processing is not performed once on all compressed image data included in the compressed image data file.
- the compressed image data is divided into some portions, i.e., the compressed image data is divided by, for example, every print line position, and the decompression processing is performed for every divided segment.
- the file pointer indicating up to which segment of the compressed image data file the decompression processing has been finished is used and recorded. Therefore, before starting the subsequent decompression processing on the compressed image data file, the file pointer is reset (step S 205 ).
- step S 201 the compressed image data file is already opened and the Huffman decompression table and the quantization table for the decompression processing are already acquired to correspond to the compressed image data file (step S 202 ), it is already determined whether it is necessary to rotate the image (step S 203 ), the rotation information map is already created if it is necessary to rotate the image (step S 204 ), and the file pointer indicating up to which segment of the compressed image data file the decompression processing has been finished is already reset (step S 205 ). Therefore, the processing goes to the subsequent step S 206 .
- step S 206 it is determined whether decompressed image data at the position N is stored in a buffer.
- the buffer may be included in the processing device such as the CPU or may be another storage device.
- step S 216 If it is determined that decompressed image data at the position N is already stored in the buffer (“Yes”, S 206 ), there is no need to decompress the image data at the position N.
- the processing goes to a procedure at a step S 216 .
- the image data at the print line position N as a correction processing subject is extracted from the buffer (step S 216 ), and the processing goes to the procedures at the step S 105 and the subsequent steps in the flowchart shown in FIG. 3 .
- the file pointer, the rotation Information map, the Huffman decompression table, and the quantization table are replaced by those corresponding to the compressed image data file as a present processing subject (step S 217 ).
- the replacement is a procedure on the assumption that a plurality of compressed image data files may be decompressed in parallel.
- the compressed image data at the position N is subjected to Huffman decompression (step S 208 ), dequantization (step S 209 ), inverse DCT (discrete cosine transform) (step S 210 ), and YCC-RGB color conversion (step S 211 ).
- the decompressed image data is stored in the buffer (step S 212 ).
- step S 213 it is determined whether it is necessary to rotate the image by 90 degrees.
- step S 213 If it is determined that it is necessary to rotate the image (“Yes”, step S 213 ), then the image is rotated, and the rotation information map already created as the preprocessing at the step S 204 is updated (step S 214 ).
- the steps S 213 and S 214 are executed uniquely if the image data compression scheme is JPEG. Accordingly, if the image data compression scheme is not JPEG, the steps S 213 and S 214 are not executed.
- step S 215 the file pointer indicating up to which segment of the image data file the decompression has been performed is saved (step S 215 ).
- the decompressed image data at the print line position N as the correction processing subject is extracted from the buffer (step S 216 ).
- the processing goes to the procedures at the step S 105 and the following steps in the flowchart shown in FIG. 3 .
- step S 217 If the position N at which the decompression processing on the compressed image data file has been finished is the last print line position of the compressed image data file (“Yes”, step S 217 ), then the compressed image data file is closed and the Huffman decompression table and the quantization table corresponding to the compressed image data file and acquired for the decompression processing are released (step S 219 ).
- FIG. 5 is a flowchart showing an example of processing procedures for the hardware-based decompression processing method.
- step S 301 If the print line position N at which the search is conducted is the first line position of the compressed image data file (“Yes”, step S 301 ), then the compressed image data file is opened, the Huffman decompression table and the quantization table for the decompression processing are acquired to correspond to the compressed image data file (step S 302 ).
- step S 303 After acquiring the tables for the decompression processing, it is determined whether it is necessary to rotate the image corresponding to the compressed image data file by 90 degrees (step S 303 ).
- step S 304 If it is determined that it is necessary to rotate the image (“Yes”, step S 303 ), a rotation information map is created (step S 304 ).
- the steps S 303 and S 304 are a preprocessing of a processing for rotating the image by 90 degrees at subsequent steps S 314 and S 315 , and executed uniquely if the image data compression scheme is JPEG.
- the steps S 303 and S 304 and the subsequent steps S 314 and S 315 are not executed.
- the file pointer indicating up to which segment of the compressed image data file the decompression processing has been finished is reset (step S 305 ).
- step S 301 the compressed image data file is already opened and the Huffman decompression table and the quantization table for the decompression processing are already acquired to correspond to the compressed image data file (step S 302 ), it is already determined whether it is necessary to rotate the image (step S 303 ), the rotation information map is already created if it is necessary to rotate the image (step S 304 ), and the file pointer indicating up to which segment of the compressed image data file the decompression processing has been finished is already reset (step S 305 ). Therefore, the processing goes to the subsequent step S 306 .
- step S 306 It is determined whether decompressed image data at the position N is stored in a buffer.
- the buffer may be included in the processing device such as the CPU or may be another storage device.
- step S 306 it is determined whether the processing device (hardware) such as the ASIC or the arithmetic processing device (CPU) is being used for the compressed image data file as a present processing subject (step S 307 ).
- the processing device such as the ASIC or the arithmetic processing device (CPU)
- step S 307 If the processing device (hardware) is not being used for the compressed image data file as the present processing subject (“No”, step S 307 ), the Huffman decompression table and the quantization table acquired to correspond to the compressed image data file as the present processing subject, the reset file pointer, and the created rotation information map are loaded into the processing device (hardware) such as the ASIC or the CPU (step S 308 ).
- the loading of the file pointer, the rotation information map, the Huffman decompression table, and the quantization table into the processing device is a procedure on the assumption that a plurality of compressed image data files is decompressed in parallel.
- step S 307 If the processing device (hardware) such as the ASIC or the CPU is being used for the compressed image data file as the present processing target (“Yes”, step S 307 ), the Huffman decompression table and the quantization table acquired to correspond to the compressed image data file as the present processing subject, the reset file pointer, and the created rotation information map are already loaded into the processing device (hardware). Therefore, the processing goes to a step S 309 and subsequent steps.
- the compressed image data at the position N is subjected to Huffman decompression (step S 309 ), dequantization (step S 310 ), inverse DCT (step S 311 ), and YCC-RGB color conversion (step S 312 ).
- the decompressed image data is stored in the buffer (step S 313 ).
- step S 314 it is determined whether it is necessary to rotate the image by 90 degrees.
- step S 314 If it is determined that it is necessary to rotate the image (“Yes”, step S 314 ), then the image is rotated, and the rotation information map already created as the preprocessing at the step S 304 is updated (step S 315 ).
- the steps S 314 and S 315 are executed uniquely if the image data compression scheme is JPEG. Accordingly, if the image data compression scheme is not JPEG, the steps S 314 and S 315 are not executed.
- step S 316 the file pointer indicating up to which segment of the image data file the decompression has been performed is saved (step S 316 ).
- the decompressed image data at the N as the correction processing subject is extracted from the buffer (step S 317 ).
- the processing goes to the procedures at the step S 105 and the subsequent steps in the flowchart of FIG. 3 .
- the processing returns to the step S 306 and the operation procedure at the step S 306 and the following steps are repeated.
- step S 318 If the position N at which the decompression processing on the compressed image data file has been finished is the last print line position of the compressed image data file (“Yes”, step S 318 ), then the compressed image data file is closed and the Huffman decompression table and the quantization table corresponding to the compressed image data file and acquired for the decompression processing are released (step S 320 ).
- the software-based decompression processing method and the hardware-based decompression processing method have both merits and demerits. As long as one of the decompression processing methods is selectively used, it is difficult to realize high-rate decompression processing in whichever case.
- the hardware-based decompression processing is basically performing for decompressing the compressed image data, and the hardware-based decompression processing and a software-based decompression processing are performed in parallel when a plurality of compressed image data files are present as the decompression processing subject. By doing so, it is possible to accelerate the decompression processing rate for decompressing the compressed image data files and to realize the high-rate decompression processing in every case.
- FIG. 6 is a flowchart showing procedures of a processing for decompressing compressed image data files according to one embodiment of the present invention.
- FIG. 7 is a block diagram showing a configuration of an image processing apparatus according to the embodiment of the present invention.
- an image processing apparatus comprises: a first storage device 21 , e.g., a ROM, a RAM, an EEPROM or an HDD, storing therein a plurality of tables including a Huffman decompression table and a quantization table necessary to decompress a compressed image data file, and storing therein a decompression processing program for decompressing the compressed image data file; a second storage device 22 , e.g., a RAM, an EEPROM or an HDD, storing therein a plurality of parameters including a rotation information map and a file pointer created and updated while the compressed image data file is being decompressed; a first processing device 11 acquiring and loading the tables including the Huffman decompression table and the quantization table stored in the first storage device 21 and the parameters including the rotation information map and the file pointer stored in the second storage device 22 , and decompressing the compressed image data file; and a second processing device 12 reading and
- an image processing method is an image processing method comprising: a first processing step of acquiring and loading a plurality of tables including a Huffman decompression table and a quantization table necessary to decompress a compressed image data file from a first storage device 21 storing therein the tables and a decompression processing program for decompressing the compressed image data file, and acquiring and loading a plurality of parameters including a rotation information map and a file pointer created and updated while the compressed image data file is being decompressed from a second storage device 22 storing therein the parameters, and decompressing the compressed image data file; and a second processing step reading and executing the decompression processing program stored in the first storage device 21 , and acquiring and reading the tables including the Huffman decompression table and the quantization table stored in the first storage device 21 and the parameters including the rotation information map and the file pointer stored in the second storage device 22 , thereby decompressing the compressed image data file, wherein the first processing step and the second
- the compressed image data file as the decompression processing subject is stored in a recording medium 31 such as a memory card, a microdrive, a CD-R or a DVD-R, and read by and input to one of or both of the first processing device 11 and the second processing device 12 .
- a recording medium 31 such as a memory card, a microdrive, a CD-R or a DVD-R, and read by and input to one of or both of the first processing device 11 and the second processing device 12 .
- the first processing device 21 is a processing device acquiring and loading the tables including the Huffman decompression table and the quantization table stored in the first storage device 21 and the parameters including the rotation information map and the file pointer stored in the second storage device 22 , and decompressing the compressed image data file, that is, a processing device responsible for the hardware-based decompression processing.
- the second processing device 12 is a processing device reading and executing the decompression processing program stored in the first storage device 21 , and acquiring and reading the tables including the Huffman decompression table and the quantization table stored in the first storage device 21 and the parameters including the rotation information map and the file pointer stored in the second storage device 22 , thereby decompressing the compressed image data file, that is, a processing device responsible for the software-based decompression processing.
- the first processing device 11 and the second processing device 12 may be either different processing devices or the same processing device.
- first storage device 21 and the second storage device 22 may be either different storage devices or the same storage device.
- step S 401 it is determined whether the position N at which the search is conducted is a first line position of the compressed image data file.
- step S 401 If the print line position N at which the search is conducted is the first line position of the compressed image data file (“Yes”, step S 401 ), then the compressed image data file is opened, the Huffman decompression table and the quantization table for the decompression processing is acquired to correspond to the compressed image data file (step S 402 ).
- step S 403 After acquiring the tables for the decompression processing, it is determined whether it is necessary to rotate the image corresponding to the compressed image data file by 90 degrees (step S 403 ).
- step S 403 If it is determined that it is necessary to rotate the image (“Yes”, step S 403 ), a rotation information map is created (step S 404 ).
- the steps S 403 and S 404 are a preprocessing of a processing for rotating the image by 90 degrees at subsequent steps S 422 and S 423 , and executed uniquely if the image data compression scheme is JPEG.
- the steps S 403 and S 404 and the subsequent steps S 422 and S 423 are not executed.
- the file pointer indicating up to which segment of the compressed image data file the decompression processing has been finished is reset (step S 405 ).
- step S 401 the compressed image data file is already opened and the Huffman decompression table and the quantization table for the decompression processing are already acquired to correspond to the compressed image data file (step S 402 ), it is already determined whether it is necessary to rotate the image (step S 403 ), the rotation information map is already created if it is necessary to rotate the image (step S 404 ), and the file pointer Indicating up to which segment of the compressed image data file the decompression processing has been finished is already reset (step S 405 ). Therefore, the processing goes to the subsequent step S 406 .
- step S 406 It is determined whether decompressed image data at the position N is stored in a buffer.
- the buffer may be included in the first processing device 11 or the second processing device 12 or may be the first storage device 21 or the second storage device 22 .
- the processing goes to a procedure at a step S 425 .
- the image data at the print line position N as a correction processing subject or target is extracted from the buffer (step S 425 ), and the processing goes to the procedures at the step S 105 and the subsequent steps in the flowchart shown in FIG. 3 .
- step S 407 it is determined whether the first processing device 11 responsible for the hardware-based decompression processing is currently active.
- the reason for determining whether the first processing device 11 responsible for the hardware-based decompression processing is currently active is as follows. In case of the image processing apparatus and the image processing method according to the embodiment of the present invention, a plurality of compressed image data files are decompressed in parallel by performing thereon the hardware-based decompression processing and the software-based decompression processing. Due to this, after starting processing procedures of the decompression processing, the first processing device 11 responsible for the hardware-based decompression processing is not necessarily always active.
- the first processing device 11 responsible for the hardware-based decompression processing is not currently active (“No”, S 407 )
- the Huffman decompression table and the quantization table acquired to correspond to the compressed image data file as the present processing subject or target, the reset file pointer, and the created rotation information map are loaded into the first processing device 11 (step S 408 ), and the first processing device 11 is started (step S 409 ).
- the loading of the file pointer, the rotation information map, the Huffman decompression table, and the quantization table into the first processing device 11 is a procedure on the assumption that a plurality of compressed image data files are decompressed in parallel.
- step S 407 it is determined whether the first processing device 11 responsible for the hardware-based decompression processing is being used for the compressed image data file as a present processing subject or target (step S 415 ).
- step S 415 If the first processing device 11 is being used for the compressed image data file as the present processing subject or target (“Yes”, step S 415 ), the Huffman decompression table and the quantization table acquired to correspond to the compressed image data file as the present processing subject or target, the reset file pointer, and the created rotation information map are already loaded into the first processing device 11 . Therefore, the processing goes to a step S 410 and subsequent steps.
- the compressed image data at the position N is subjected to Huffman decompression (step S 410 ), dequantization (step S 411 ), inverse DCT (step S 412 ), and YCC-RGB color conversion (step S 413 ).
- the decompressed image data is stored in the buffer (step S 414 ).
- step S 422 it is determined whether it is necessary to rotate the image by 90 degrees.
- step S 422 If it is determined that it is necessary to rotate the image (“Yes”, step S 422 ), then the image is rotated, and the rotation information map already created as the preprocessing at the step S 404 is updated (step S 423 ).
- the steps S 422 and S 423 are executed uniquely if the image data compression scheme is JPEG. Accordingly, if the image data compression scheme is not JPEG, the steps S 422 and S 423 are not executed.
- step S 424 the file pointer indicating up to which segment of the image data file the decompression has been performed is saved (step S 424 ).
- the decompressed image data at the N as the correction processing target is extracted from the buffer (step S 425 ).
- the processing goes to the procedures at the step S 105 and the subsequent steps in the flowchart of FIG. 3 .
- the first processing device 11 responsible for the hardware-based decompression processing is determined to be currently active at the step S 407 (“Yes”, S 407 ), and is determined to be being unused for the compressed image data file as the present processing subject or target at the step S 415 (“No”, S 415 ), this means that the first processing device 11 is being used for the other compressed image data file.
- the image processing apparatus and the image processing method according to the embodiment of the present invention is provided on the assumption that a plurality of compressed image data files are decompressed in parallel.
- the decompression processing is to be performed on the compressed image data file as the present processing subject or target using the first processing device 11 that is being used for the other compressed image data file, then overhead for loading the tables including the Huffman decompression table and the quantization table necessary for the decompression processing for every compressed image data file and for replacing decompression progress information is increased.
- the longer overhead makes it difficult to perform the hardware-based decompression processing at the higher processing rate than that of the software-based decompression processing.
- the decompression processing is not performed on the compressed image data file as the present processing subject or target using the first processing device 11 that is being used for the other compressed image data file.
- the compressed image data file as the present processing subject or target is decompressed using the software-based decompression processing in parallel to the other compressed image data file. It is thereby possible to accelerate the decompression processing rate for each compressed image data file.
- the second processing device 12 that has been set active by reading in advance the decompression processing program stored in the first storage device 21 replaces the file pointer, the rotation information map, the Huffman decompression table, and the quantization table by those corresponding to the compressed image data file as the present processing subject or target based on the function of the decompression processing program (step S 416 ).
- the replacement is a procedure on the assumption that a plurality of compressed image data files may be decompressed in parallel.
- the compressed image data at the position N is subjected to Huffman decompression (step S 417 ), dequantization (step S 418 ), inverse DCT (step S 419 ), and YCC-RGB color conversion (step S 420 ).
- the decompressed image data is stored in the buffer (step S 421 ).
- step S 422 it is determined whether it is necessary to rotate the image by 90 degrees.
- step S 422 If it is determined that it is necessary to rotate the image (“Yes”, step S 422 ), then the image is rotated, and the rotation information map already created as the preprocessing at the step S 404 is updated (step S 423 ).
- the steps S 422 and S 423 are executed uniquely if the image data compression scheme is JPEG. Accordingly, if the image data compression scheme is not JPEG, the steps S 422 and S 423 are not executed.
- step S 424 the file pointer indicating up to which segment of the image data file the decompression has been performed is saved (step S 424 ).
- the decompressed image data at the print line position N as the correction processing subject or target is extracted from the buffer (step S 425 ).
- the processing goes to the procedures at the step S 105 and the following steps in the flowchart shown in FIG. 3 .
- step S 426 If the position N at which the decompression processing on the compressed image data file has been finished is the last print line position of the compressed image data file (“Yes”, step S 426 ), then the compressed image data file is closed and the Huffman decompression table and the quantization table corresponding to the compressed image data file and acquired for the decompression processing in the first processing device 11 and the second processing device 12 are released (step S 428 ).
- step S 428 it is determined whether the first processing device 11 responsible for the hardware-based decompression processing is being used for the compressed image data file as the processing subject or target (step S 429 ). If the first processing device 11 is being used for the compressed image data file as the processing subject or target (“Yes”, step S 429 ), then the first processing device 11 is deactivated (step S 430 ), and all the processing procedures for the decompression processing on one compressed image data file are finished.
- the hardware-based decompression processing is basically performing for decompressing the compressed image data, and the hardware-based decompression processing and a software-based decompression processing are performed in parallel if a plurality of compressed image data files are present as the decompression processing subject or target, thereby, it is possible to accelerate the decompression processing rate for decompressing the compressed image data file and to realize the high-rate decompression processing in every case.
- a pointer table and a buffer area are provided in a storage device, e.g., an SDRAM to correspond to each image data file whenever an image data file is discovered by search of the image data file for every print lint position N (see the step S 102 in the flowchart of FIG. 3 ).
- a pointer table and a buffer area corresponding to the image data file A, a pointer table and a buffer area corresponding to the image data file B, a pointer table and a buffer area corresponding to the image data file C, and the like are sequentially provided in the predetermined storage device such as the SDRAM.
- a buffer provided in either the first processing device 11 or the second processing device 12 may be used or either the first storage device 21 or the second storage device 22 may be used.
- the other storage device (not shown) may be used as the predetermined storage device.
- image data file A image data of the image data file A is sequentially decompressed and corrected according to the processing procedures shown in the flowchart of FIG. 3 (see the steps S 104 and S 105 in the flowchart of FIG. 3 ).
- the detailed processing procedures for the decompression processing are already described with reference to the flowcharts of FIGS. 4 , 5 , and 6 .
- the corrected image data is held in the buffer area provided for the image data file A. Furthermore, a file pointer indicating up to which segment of the compressed image data file A the decompression processing has been finished is saved in the pointer table provided for the image data file A.
- corrected image data of the other image data files B, C, . . . are held in the buffer areas provided for the image data files B, C, . . . , respectively.
- file pointers each indicating up to which segment of the compressed image data file B, C, . . . the decompression processing has been finished are saved in the pointer tables provided for the image data files B, C, . . . , respectively.
- a size of each of the corrected image data sequentially extracted from the buffer areas corresponding to the respective image data files A, B, C, . . . in the predetermined storage device Is converted into a printing size according to a print layout (see the step S 106 in the flowchart of FIG. 3 ), arranged according to the print layout (see the step S 107 in the flowchart of FIG. 3 ), and stored in a band buffer for every line.
- the band buffer is a buffer for holding image data corresponding to a length of a print head, that is, corresponding to a band print region printable once from a top nozzle to a last nozzle of the print head.
- a buffer provided in either the first processing device 11 or the second processing device 12 may be used or either the first storage device 21 or the second storage device 22 may be used.
- the other storage device (not shown) may be used as the band buffer.
- image data on each line for every predetermined lines corresponding to the microweave printing is extracted.
- Each image data is subjected to a halftone processing for converting a tone of each image into a tone at a gradient which the printer can deal with (see the step S 109 in the flowchart of FIG. 3 ), thereby converting the image data into final print image data that can be actually printed.
- the final print image data is stored in a microweave printing buffer.
- a buffer provided in either the first processing device 11 or the second processing device 12 may be used or either the first storage device 21 or the second storage device 22 may be used.
- the other storage device (not shown) may be used as the microweave printing buffer.
- microweave printing is executed based on the image data on each line for every predetermined lines stored in the microweave printing buffer (see the step S 110 in the flowchart of FIG. 3 ).
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US9362948B2 (en) * | 2008-02-14 | 2016-06-07 | Broadcom Corporation | System, method, and computer program product for saving and restoring a compression/decompression state |
JP2011077564A (en) * | 2008-04-13 | 2011-04-14 | Thomson Canopus Co Ltd | Encoder and encoding method of video and voice data, and video editing system |
US8244911B2 (en) * | 2008-07-22 | 2012-08-14 | International Business Machines Corporation | Method and apparatus for concurrent and stateful decompression of multiple compressed data streams |
US9378560B2 (en) * | 2011-06-17 | 2016-06-28 | Advanced Micro Devices, Inc. | Real time on-chip texture decompression using shader processors |
US10657053B2 (en) * | 2017-03-31 | 2020-05-19 | Kyocera Document Solutions Inc. | Memory allocation techniques for filtering software |
CN113626092A (en) * | 2021-10-14 | 2021-11-09 | 广州匠芯创科技有限公司 | Embedded system starting method and SOC chip |
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